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通过详细的钻孔地质编录和显微镜下鉴定,对扎西康锌多金属矿床的矿石组构特征进行系统研究。矿区矿石构造主要为典型的由充填交代作用形成的块状构造、(网)脉状构造、浸染状构造、角砾状构造、晶洞及晶簇状构造。矿石结构主要为结晶作用和交代作用形成的结构,其次为压力作用和固溶体分离作用形成的结构。由于矿区构造作用和矿化作用具多期次性和复杂性,因而由交代作用形成的结构最为普遍且类型繁多。基于本次矿石组构研究成果,结合前人的研究资料,将矿区成矿期大致分为沉积成岩期、中低温热液成矿期和表生氧化期,其中,中低温热液成矿期是矿床最主要的成矿期。根据矿物组合特征,划分出6个成矿阶段:黄铁矿-石英-方解石阶段、闪锌矿-黄铁矿-方铅矿-毒砂-铁菱锰矿阶段、方铅矿-闪锌矿-硫盐矿物阶段、石英-方解石-辉锑矿阶段、石英-方解石阶段和氧化物阶段。最终,确定扎西康锌多金属矿为受构造-岩浆活动控制的中低温热液充填交代型矿床。
Through detailed borehole geological cataloging and microscopic identification, the ore structure characteristics of Zhaxi Kang Zinc polymetallic deposit are systematically studied. The ores in the ore district are mainly composed of massive block structures formed by filling and metasomatism, vein-like structures, disseminated structures, brecciated structures, geode holes and crystalline clusters. The ore structure is mainly formed by crystallization and metasomatism, followed by the structure formed by pressure and solid solution separation. Due to the multi-temporal nature and complexity of the tectonic and mineralization in the mining area, the structure formed by the metasomatism is the most common and the most numerous. Based on the research results of the ore structure and the previous research data, the mineralization stages of the ore district are roughly divided into sedimentary diagenesis stage, mid-low temperature hydrothermal mineralization stage and epiphytic oxidation stage. Among them, the mid-low temperature hydrothermal mineralization stage Is the most important mineralization of the deposit. According to the characteristics of mineral assemblage, six metallogenic stages are divided: pyrite - quartz - calcite stage, sphalerite - pyrite - galena - arsenopyrite - Tieling manganese stage, galena - sphalerite - Sulfur salt mineral phase, quartz-calcite-stibnite phase, quartz-calcite phase and oxide phase. Finally, the Zaxi Kang zinc polymetallic deposit is confirmed to be a medium- and low-temperature hydrothermal-filled metamorphic deposit controlled by tectono-magmatic activity.